UNIVERSITY OF FLORIDA PT. 422.-Vegetable Diseases. 1 hour, and 4 hours laboratory. 3 credits. Offered 2. The most destructive diseases of beans, cabbage, celery, cucumbers, eggplant, lettuce, peppers, potatoes, tomatoes, watermelons and other vegetable crops grown in Florida and the recognition of certain vegetable diseases originating elsewhere. PT. 423.-Fruit Diseases. 1 hour, and 4 hours laboratory. 3 credits. Of- fered 2. Diseases of sub-tropical and tropical fruits, such as citrus, avocado, banana, fig, guava, loquat, mango, papaya, persimmon, pineapple and other fruit crops grown or marketed in Florida, including apple brambles, cherry, grape, peach, pear, plum and strawberry. PT. 424.-Field Crop Diseases. 1 hour, and 4 hours laboratory. 3 credits. Offered 1. Characteristics, cause and control of the diseases of the principal farm crops such as corn, cotton, grasses, oats, peanuts, rye, sorghum, sugar cane, tobacco, tung, etc. PT. 425.-Diseases of Ornamental Plants. 1 hour, and 4 hours laboratory. 3 credits. Offered 1. Diagnosis and control of the prevalent diseases of annuals, bulbs and perennial her- baceous and shrubbery ornamental plants in Florida. PT. 426.-Market Pathology. 1 hour, and 4 hours laboratory. 3 credits. Offered 1. Acquaintance with diseases, detection and recognition of deterioration of perishable plants and plant products occurring at origin, in transit and at destination, including storage and retail market. PT. 434.-Mycology. 1 hour, and 4 hours laboratory. 3 credits. Offered 2. A study of the fungi that pertain specifically to their basic classification according to recognized standards. PT. 444.-Advanced Plant Pathology. 1-2 hours, and 4-8 hours labora- tory. 3-6 credits. Offered 1, 2, 3. A study of methods of research in plant pathology, life histories of parasitic organ- isms in relation to the host plant, environmental factors influencing the development of diseases; all diseases of certain crop plants and specific diseases common to a wide va- riety of hosts. GRADUATE COURSES Prerequisites: (1) Bachelor's degree. (2) PT. 421 or equivalent. (3) Thirty semes- ter hours in biological sciences, 15 of which should be in botany. PT. 505.-History of Plant Pathology. 1 hour. 1 credit. Offered 1. A correlation of recorded historical events and the trends and development of plant pathology as an exploration of our current knowledge of plant diseases. PT. 506.-Plant Pathology Literature. 3 hours laboratory. 1 credit. Of- fered 2. The knowledge of existing and available source material, current technical publica- tions dealing with plant diseases and their evaluation as aids in conducting research. The statement "Offered 1" means offered first semester; 2, second semester; 3, summer session.